Results 211 to 220 of about 34,233 (259)
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The SkyBridge constellation design
17th AIAA International Communications Satellite Systems Conference and Exhibit, 1998The SkyBridge space segment, based upon Low Earth Orbit satellites, had to face a challenge: though using the same frequency band as various geostationary systems in order to profit by well-proven and cost-efficient techniques — i.e. Ku Band -, SkyBridge satellites must not in any way interfere with geostationary satellites.
E. Lansard, J.-L. Palmade, V. Martinot
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Constellation Design for Cooperative Communication
2009 43rd Annual Conference on Information Sciences and Systems, 2009In this paper, a single-hop single-relay system with a direct link between the source and the destination is considered when the relay operates in the half-duplex mode. Motivated by the concept of signal space diversity, this paper introduces signal space cooperation, in which cooperation between the source and the relay is achieved using a novel ...
Seyed Ali Ahmadzadeh +2 more
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Design of Flower Constellations for Telecommunication Services
Proceedings of the IEEE, 2011Satellite constellation designers take into consideration the entire telecommunication network and their design choices are influenced by many factors including: number of satellites, orbital characteristics, coverage area, network interconnections, system cost, and complexity.
Daniele Mortari +2 more
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Design of Spatial Constellation for Spatial Modulation
IEEE Wireless Communications Letters, 2020In order to achieve the transmission of more extra information bits, a new design, called spatial modulation with spatial constellation design (SM-SC), is proposed to extend the size of a spatial constellation diagram in spatial modulation (SM) system by designing the component formation of the transmitted spatial constellation vector (TSV).
Fuchun Huang, Yiju Zhan
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GPS Solutions, 2001
A significant effort has been carried out in Europe to define the European Global Navigation Satellite System (GNSS), named Galileo Satellites flying in Medium Earth Orbits (MEO) will compose the system (according to the most recent architecture definition baseline); a regional complement of geosynchronous satellites may be required to increase ...
Álvaro Mozo-García +3 more
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A significant effort has been carried out in Europe to define the European Global Navigation Satellite System (GNSS), named Galileo Satellites flying in Medium Earth Orbits (MEO) will compose the system (according to the most recent architecture definition baseline); a regional complement of geosynchronous satellites may be required to increase ...
Álvaro Mozo-García +3 more
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Satellite-constellation design
Computing in Science & Engineering, 1999Presents the rudiments of constellation design to familiarize the reader with some of this field's methods, issues, and concerns. Two exotic constellations are under consideration for various missions.
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The constellation design problem
Annales Des Télécommunications, 1995We introduce here a new approach for designing constellations (signal sets) at high signal-to-noise ratio. It is based on a geometric formulation of the design problem. The sphere packing formulation for the Gaussian case stems as an example and the results that this approach gives on fading channels are surveyed.
Xavier Giraud, Jean -Claude Belfiore
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An Efficient LEO Global Navigation Constellation Design Based on Walker Constellation
2020 IEEE Computing, Communications and IoT Applications (ComComAp), 2020Compared with medium Earth orbit (MEO) and high Earth orbit (HEO) satellites, low Earth orbit (LEO) satellites have lower cost, smaller power loss and shorter transmission delay, which mean they can be used in many areas like navigation and space-based internet of things (IOT), etc.
Yanbo Wei, Huaijian Li, Xiaojing Du
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Design of Constellation Sets for Multistage Systems
2016 IEEE Global Communications Conference (GLOBECOM), 2016Abstract-We consider the problem of designing constellation sets for multistage systems for high spectral efficiencies. In particular we will focus on two-stage systems where the cascaded decoding stages are associated to three types of receivers with different complexities and performances.
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Constellation Design via Capacity Maximization
2007 IEEE International Symposium on Information Theory, 2007Traditional constellations are uniformally spaced. By giving up uniform spacing, constellations can be designed to have larger joint (i.e. overall) capacity or parallel decoding capacity. In this paper non-uniformally spaced (i.e. 'geometrically' shaped) constellations are designed to maximize either of these quantities.
Maged F. Barsoum +2 more
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